nurat_s_convert  1204 rational.c     static VALUE nurat_s_convert(int argc, VALUE *argv, VALUE klass);
nurat_s_convert  1212 rational.c         return nurat_s_convert(2, a, rb_cRational);
nurat_s_convert  1599 rational.c         rb_define_private_method(CLASS_OF(rb_cRational), "convert", nurat_s_convert, -1);